I haven't seen any mini ROTF Optimus's anywhere so I thought I should give it a shot and well...It worked out pretty well.
This is mini Nightwatch Optimus Prime. He is in this mode when he is patrolling around keeping places safe at night. That is why he has the dark colors so he can blend in with the night.
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About this creation
SORRY IF THE PICTURES ARE BLURRY.
The reason why he is not the original colors is because the parts I needed were not the colors that Optimus usually is so I made my own mini version called Nightwatch Optimus.
This is Optimus in robot mode. I don't know if you can see it but he is holding an ion cannon in his right hand.